Creepy surveillance footage, pictures of her victim's bedroom and fridge as well as a list entitled 'Decision: Kill vs Knockout' have surfaced as a South Australian woman is sentenced to 12 years jail for the attempted murder of her ex-partner's new girlfriend.

Amy Kasehagen, of Richmond, broke into 28-year-old Bronson Hayter's Adelaide home and tried to kill her in April last year after months of surveillance and planning.

Footage obtained by 9 News shows her surveillance work in the lead up to the horrific murder attempt, as Kasehagen stakes out her victim's house, noting to herself what time the woman leaves and what she is wearing.

Scroll down for video

Bronson Hayter (pictured after the attack) was hit repeatedly over the head with a hammer and suffocated

One note found in Kasehagen's possession, entitled 'Kill Bronson - bitch deserves it', shows a detailed plan of how she could kill her victim